A leading American religious thinker of that time called Doctor Spock "the father of permissiveness."

VOA: special.2009.03.15

Robert Frost was like an earlier New England writer and thinker, Ralph Waldo Emerson.

VOA: special.2011.04.17

He was a very independent thinker at an early age.

VOA: special.2010.05.30

John Dewey was an influential thinker and educator.

VOA: special.2010.01.07

Engineer.Inventor.Thinker.Poet.

VOA: special.2010.05.30

And his newly published book, an exploration of the Darwin's influence on science, philosophy and popular culture, is the culmination of a lifelong interest in the thinker.

VOA: standard.2009.11.25